If you can't use /ping in Essentials Plugin,
You can use this Script

Before you install this skript , You Need to Install the Plugins First :

• - Skript-1.8 (For 1.8) [Tested with Skript 2.5.3]
  - Skript (For 1.9+)

Features :

• Admin Commands!
• Can check your ping!

Command :

• /ping [player]
• /pings help
• /pings reload (Reload the skript)
• /pings serverinfo (Server Information)

Permissions:

• checkping.admin

If you like this script , please rate 5 stars